- Written by Phillip Jie
- Posted on December 19, 2019
- Updated on February 5, 2022
- 13069 Views
This article describes the support for specifying User Defined Fields(UDF) in Port ACLs including IPv4, IPv6, and
- Written by Ayush
- Posted on September 5, 2025
- Updated on September 5, 2025
- 688 Views
User Defined Fields (UDFs) are access-list (ACL) filters that consist of an offset into a packet and a pattern to match at the given offset. It can be used to match non-standard fields in a packet that don’t have existing well-defined filter criteria. An example of a non-standard field is bytes at an arbitrary offset within a UDP payload.